I don't have a pic right now but I constructed one from PVC pipe...this may work for you. We cut about 2 in. wide strip off one side of a pipe, lengthwise. Added L-joints on the ends with straight pieces approx. 3 ft. long extending up from the L-joints. Imagine a squared off U-shaped feeder. Placed 2x4 pieces to bring it out from the wall a little and attached the upright tubes to the 2x4s with radiator hose style clamps. This makes it easy to adjust the height from large birds down to chicks. Its too slick for roosting on, the limited opening insures little flicking of food out of the trough, and I only have to fill the holding tubes every 3-4 days. I bet something like this could be adapted with a longer trough pipe and T-joints at regular intervals along the trough until it was large enough for 50 birds. I covered the tops of the uprights with plain PVC end caps.

get a pvc pipe (atleast 2in in diameter) come about 1ft from the bottom and cut a hole (about an inch) and pound it in the ground to where about a 1/2 an inch is showing,get a cap for the top and fill it up

but for 50 chickens i would go with something bigger like a 10 inch pipe

I used a Herbalife plastic shake container, cut 3 areas that were about 1 inch high and 3 inches wide, cover side up. Then a 3 lb coffee (plastic) cut at about 1 1/2 inch high then poked holes in the center of the coffee can, bottom and the top lid of the conatiners. Then with a large knot, begin "threading" the (used Bailing twine) string having the bottom being the coffee can layer, then just thread up through the next plastic container and through the lid. Tie it up on the cover or beam( works best for small groups of chicks, 6-9 birds). When you want to fill the feeder, take down , sit on something solid, unscrew lid and fill.
I imagine you could make a waterer about the same way, only using wire or glue to attach the coffee can to the white canister.
Someday I'll remember how I uploaded pics again. grrrr.

What i have is a 1 1/2 piece of pvc. With a jucy juice bottle for a funnel. It goes in a bucket with 1 1/2 holes in the bottom feed about every 2 weeks stays dry to. Hop this helps. the white bucket on top covers the hole. the board on the bottom has a 2bt2 to keep the feed in

Sorry about that, for a large bunch of chickens, have 2 square hunks of wood, cut them at a 5" square, then cut 2 long boards (what ever your choice is) 5" wide. Using nail gun or hammer, make a V out of "boards" and then nail the ends on. If you want taller feeders, make it larger. Use Chick wire to cover the feeder, then they wont flick it as quickly.
Good luck